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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0152075de1175733bb840ffe99f899650d981e3f10e85ed01121066749eafc9' 
  AND token = '82AtHB0XGiECENzSwVsRmrBIFbnG8dY5uBDIpqfx9vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}